Hi,
Somehow an extra repository head was created again. I think I have fixed it.
To avoid this, as noted in http://www.w3.org/2011/prov/wiki/Mercurial_repository, it's good to do a hg pull/hg update before doing any commits, as then you have a chance to resolve any conflicts locally and avoid creating new heads.
Fingers crossed that I haven't messed it up for others.
--James
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